P0151 2017 GMC Sierra Code - HO2S Circuit Low Voltage Bank 2 Sensor 1
Quick Answer
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Front Heated Oxygen Sensor Bank 2, Front Heated Oxygen Sensor Bank 2 harness is open or shorted, Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0151 2017 GMC Sierra indicates HO2S Circuit Low Voltage Bank 2 Sensor 1.
- Common causes
- Common causes include Faulty Front Heated Oxygen Sensor Bank 2, Front Heated Oxygen Sensor Bank 2 harness is open or shorted, Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0151 2017 GMC Sierra Description
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the heated oxygen sensor is shorted to ground if the HO2S voltage is less than 50 mV.
What are the Possible Causes of the DTC P0151 2017 GMC Sierra?
- Faulty Front Heated Oxygen Sensor Bank 2
- Front Heated Oxygen Sensor Bank 2 harness is open or shorted
- Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Low or high fuel system pressure
- Fuel contamination
- Faulty fuel injectors
- Exhaust gas leaks
- Engine vacuum leaks
How to Fix the DTC P0151 2017 GMC Sierra?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0151 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about P0151 2017 GMC Sierra Code
1. What does the OBDII code P0151 mean on a 2017 GMC Sierra?
P0151 indicates that the oxygen sensor (HO2S) on Bank 2 Sensor 1 is reporting a low voltage, suggesting it’s detecting a lean air-fuel mixture.
2. What are the common symptoms of code P0151 in a 2017 GMC Sierra?
Symptoms may include decreased fuel efficiency, rough idling, engine hesitation, or an illuminated check engine light.
3. What causes code P0151 on a 2017 GMC Sierra?
Common causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's air-fuel mixture.
4. How do I know which sensor is Bank 2 Sensor 1 on my 2017 GMC Sierra?
Bank 2 refers to the side of the engine opposite the #1 cylinder, and Sensor 1 is the upstream oxygen sensor located before the catalytic converter.
5. Can I drive my 2017 GMC Sierra with code P0151?
While the vehicle may still be drivable, prolonged driving with this code can lead to increased emissions and potential damage to the catalytic converter.
6. How do I fix code P0151 on my 2017 GMC Sierra?
Repairs may involve replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or addressing air-fuel mixture issues.
7. How much does it cost to repair code P0151 on a 2017 GMC Sierra?
The cost varies, but replacing an oxygen sensor typically costs $150–$300, including parts and labor. Additional repairs for wiring or exhaust leaks may increase the cost.
8. Can a dirty air filter cause code P0151 on a 2017 GMC Sierra?
A dirty air filter is unlikely to directly cause P0151, but it can contribute to air-fuel mixture issues that affect sensor readings.
9. How do I diagnose code P0151 on a 2017 GMC Sierra?
Use a scan tool to confirm the code, inspect the oxygen sensor and wiring for damage, check for exhaust leaks, and test the air-fuel ratio.
10. Is code P0151 on a 2017 GMC Sierra covered under warranty?
It may be covered under the powertrain or emissions warranty if the vehicle is within the coverage period. Check with your dealer for details.
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